It was actually a mk 1 that was used, and the race was over 1/5 of a mile, not the 1/4 mile - they only showed the first 1/5th, because by the quarter mile the mk4 was ahead.
If you care to do a search on here, the owner of the mk1 that was used actually posted this information.
Autocar did a test a couple of years ago when they took a Mk1 a Mk2 a Mk3 and a Mk4 to the track.
Mk1 came 4th
Mk2 came 3rd
Mk3 came 2nd
Mk4 came 1st
The older ones may not be as raw as the early ones chaps, but they prove to be a faster package. Lap times don't lie.....